Synthesis and photoluminescence properties of NaYGeO4:Bi3+ phosphors

Abstract

In this paper, NaYGeO4:[Formula: see text]Bi[Formula: see text] phosphors were successfully prepared by high-temperature solid-state reaction. XRD patterns and refinement results show that Bi[Formula: see text] ions are successfully incorporated into the matrix material and replaced by Y[Formula: see text]. The emission spectrum shows that the optimal doping concentration of the sample is 0.25%, and it is theoretically studied that the concentration quenching is caused by the nearest neighbor ions. The fluorescence lifetime curve showed that with the increase of Bi[Formula: see text] concentration, the fluorescence lifetime first increased and then decreased. The thermal stability of the sample was studied, and it was found that when the temperature increased to 523 K, the luminescence intensity of the phosphor was still 70% of the initial intensity, and the activation energy was calculated to be 0.306 eV. Finally, the CIE color coordinates of the sample with the best luminous intensity were calculated as (0.1595, 0.0342), and the color coordinates are located in the blue light region.